Adjustable Slit on Stem with symmetric aperture, in black metal frame on stem. With micrometer screw, Holder: 130 mm dia, Slit width: 0-3 mm, Slit height:25 mm, Shaft: 10 mm dia.
Baseline* Windmill Type, Compact, lightweight spirometer for screening large population, Subject blows into disposable mouthpiece. Indicator registers forced vital lung capacity up to 7 liters. Comes with 50 plastic mouth pieces, Dimensions: 3.5 x 3 x 3.5in
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